Eggs fertilised by feminized males are used and newly fertilised eggs
are first held for 30 minutes at 10oC, they are then
transferred directly into 28oC water for 10 minutes before returning them directly to the
10oC water. .

Atlantic Salmon (Salmo salar)

Good results have been gained through a heat shock at
32oC for 5 minutes or 30oC for 10 minutes, mortality rates in this process can be high. Pressure shocks of 700bar for 3-6 minutes, administered 20 minutes after fertilisation have proved to give triploid yields as high as the temperature shock but with lower
mortalities